Gag orders are rarely used for this purpose. The information that so-and-so parties provided some information (without disclosure of that information) in respo

Gag orders are rarely used for this purpose. The information that so-and-so parties provided some information (without disclosure of that information) in response to a lawful request will usually not predudice a trial. What gag orders are for is a) avoiding tipping off the subject of an active investigation b) avoiding general knowledge or disclosure of key sources of information and investigative methods used by law enforcement and c) concealing the general scale, nature and purpose of surveillance activities from the general public.